sin(x-y) - sinxcosy-cosxsiny, cos(x+y) - cosxcosy-sinxsiny, cos2x - cos2x-sin2x, cos(x/2) - ±√(1-cosx)/2, sinx+siny - 2sin⦍(x+y)/2⦐cos⦍(x-y)/2⦐,

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